Hydraulic brake-operating means



July 31, 1928.-

A. MOSER HYDRAULIC BRAKE OPERATING MEANS Filad NOV. 5, 1927 m Qua/amp f 6 a a f 7 w 6 a d I M 7 m M a J U w a w m 6 4 Huh 4 4 J o HQ A4 5 W T m W Patented July 31, 1928.

UNITED. STATES ATENT oFFIcE. 7

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HYDRAULIC BRAKE-dPERATIlIQ MEANS.

Application filed November 8, 1927. Serial No. 280,778.

The invention relates to hydraulic vehicle brakes and specifically to operating means for the brake units associated with the.

leakage, to advance considerably ahead of the other rod. It is the aim of my invention to provide new and improved equalizing means whereby thisv difiiculty is efiectively overcome.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and-claimed, the description being supplemented by the accompanying drawings.

Fig. 1 is a sectional view partly in elevation showing the invention in the relation with other parts, assumed when the two piston rods advance uniformly.

Fig. 2 is a view similar to Fig. 1 but showing the manner in which the improved equalizing means com ensates for non-uniform advance of the piston rods.

Fig. 3 is a sectional perspective view illustrating a modified form of equalizing means, this view being principally for the purpose of showing that the pivotal and combined pivotal and slidable connections between the operating member, equalizing lever and piston rods, need not be of the forms shown in Figs. 1 and 2.

In the drawings above briefly described, the numerals 4 denote two parallel cylinders connected by .appropriate piping 5 with the brake units (not shown) and connected by additional piping 6 with a feeder tank (notshown). Slidable in these cylinders, are two pistons 7 whose parallel piston rods 8 extend through bosses .9 at one end of said cylinder. At the rear ends of these rods (rear being used with reference to the operative or advancingv movement of the pistons and rods rather than with regard to the vehicle) is an operating member 10 preferably in the form of a push rod having suitable connection with the usual brake pedal (not shown). The improved equalizmg means is provided to connect the operating member-l0 with the rods .8, .and.the preferred construction disclosed in Fig's. 1 and 2 W111 first be described.

' The rear ends of the rods 8 are provided with forks 11 and with pivot pins 12 extending across said forks. Similarly, the front end of the operating rod 10 is provided with a fork 13 and with a pivot pin 14 extending across said fork. A flat equalizing lever 15 passes through the three forks 11-13 and pro]ects laterally beyond said forks 11, the central portion of said lever being formed w th an opening through which the pivot pm 14 passes, while the end portions of said lever are provlded with slots 16 through which the pivot pins 12 pass. These slots are so spaced that when the lever 15 is at Y r1ght angles to the rods 8, the pins '12 are seated against the inner end walls 17, so that forward movement of the rod 10 will exert a direct forward pressure upon the rods 8,

havin no tendency whatever to exert any I posed in advance of a-line intersecting the pivots 12 so that the forward push on said rod Wlll have no tendency to tilt said lever 15 about an axis extending longitudinally of said lever. 4

If for any reason such as a leak in the plplng connected with one ofthe cylinders 4, the piston 7 and rod 8 of this-cylinder are permitted to advance more rapidly than the other piston and rod, compensation for such differential movement is provided by the equalizing lever 15, and regardless of the difference in travel of these rods, the fluidforcing pressure thereon Will be so exerted as to cause no lateral stress upon the rods, with consequent danger of binding them or of causing springing thereof. Preferably,

-when either rod 8 moves inwardly to the maximum, its movement is limited b contact of its fork 11 with theadjacent oss 9, but it is to be understood that this particular limiting means is not essential as some other could well be provided.

In the contsruction shown in Fig. 3, the

- The lever 19 is formed with stops 21 at the inner sides of the eyes 18, corresponding to the slot ends 17 above described.

The operating member or rod 10 in Fig. 3 is rovided with a fork 22 whose crotch 23 is of substantially V-shape to engage a seat 24 at the center of the lever 19, establishing a pivotal connection between said lever and the rod 10. Rearward movement of rod 10 with respect to lever 19 may be prevented by a pin 25 connecting the fork arms and disposed .in front of said lever. As in the form of construction previously described, the pivotal connection between the operating member or rod 10an-d the lever 19, is in advance of the pivots forming parts of the means for establishing combined pivotal and slidable connections between said lever and the piston rods 8. As previously stated, the construction shown in Fig. 3 is embodied principally to illustrate that the pivotal and combined pivotal and slidable connections need not be of the. forms shown in Figs. 1 and 2, and it will be understood that variations in construction other than those herein illustrated, may be made within the scope of the invention as claimed.

I claim:

1. In a hydraulic brake operating means, two parallel piston rods, a transverse equalizing lever extending transversely between the outer ends of said piston rods, two combined pivotal and slidable connections connecting said equalizing lever with said rods and permitting swinging of said lever in lever transversely of the rods incident to member such swinging, and an operatin e central having a pivotal connection with t portion of said lever.

2. A structure as specified in claim 1; the pivotal connection between said 0 crating member and said equalizing lever being in advance of said pivots of said combine'dpivotal and slidable connections.

3. In a hydraulic brake operating means, two parallel piston rods having pivots at their rear ends, an equalizing lever extending transversely between said rods, said lever having end portions which project laterally from said rods, abut the rear sides of said pivots and diverge forwardly from said rods, and an operating member having a pivotal connection with the central portion of said lever.

4. A structure as specified in claim 3;-said pivotal connection being in advance of said pivots.

5. In a hydraulic brake operating means,

two parallel piston rods having forks at their rear ends and pivot pins passing'across said forks, an equalizing lever extending transversely between said forks and passing through and beyond the same, the end portions of said lever being formed with slots which diverge forwardly and receive said pivot pins, and anoperating member having a pivotal connection with the central portion of said lever.

6. A structure as specified in claim 5; said pivotal connection being in advance of said pivot pins.

In testimony whereof I have hereunto aflixed my signature.

ARTHUR MOSER. 

